Malicious PDF — malware analysis report

Static analysis result for SHA-256 f956cc7a33a40838…

MALICIOUS

PDF

92.3 KB Created: 2021-07-30 02:56:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fcf49526e1c9768ec2d807de3841b9e0 SHA-1: 25558dd800fb523d5ec824cd763abdf3b237c3e4 SHA-256: f956cc7a33a40838f049acc7822e198ed7bdb18fe792a850bd65e16463d2b79a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm pointing to compromised WordPress sites. The PDF contains numerous external URIs, many of which lead to potentially malicious content hosted on compromised domains. No scripts were extracted, but the overall structure suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160de3893047e8---74999914079.pdf In PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608069a09bfee---17897294132.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607eea63e62d1---lisobonuzesigopobufunexol.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/fosonuvutivi.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160832045de2c7---12413348139.pdfIn PDF document text
    • https://coil.hk/upload/files/43982904828.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99687a35f---96200551924.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/91d4cb7e1b11b3c9a2f178cd51fa4ea5/deledonilenekoruxowemud.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/g7d6ppv7nnedusk7jceplalqe4/64467054167.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9107d651caf4e2be73c52f0d0fd3806f/gadulazerusubumolexow.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/i01pn7aelnk0t4s95ekl89pgbs/xisufusaximadoj.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/tajevibana.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/xemugezujidogowoli.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/todunimewuwu.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d81c3a312f6---98220252067.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/90800580462.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/43375145377.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/ruxodenuko.pdfIn PDF document text
    • http://flexa.cz/docs/file/78547231821.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/4054085900.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e24440a5108---bamoje.pdfIn PDF document text
    • https://rotherelectric.com/files/87586679577.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/19193028634.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/67266ee6e768c9af1f8880fccaa65c88/62536087175.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/melesogabasugejorupoxizo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=ejercicios+para+tener+una+letra+bonitaPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001012f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012F 10720 bytes
SHA-256: b8d9f04c9b56022f9efb83fbff0317a6ccd9a77c9bd286f5b7f5e09f7cbacef8
font_01_sfnt_off000119aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131BC 18856 bytes
SHA-256: 6278993764baa23a1a7e666249f2f5b4736e7afb71e6c89a2ac9fb343de455f0

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